[ValueTracking][NFC]: Use injected condition to compute known FPClass

Author: hassnaaHamdi

llvm/include/llvm/Analysis/SimplifyQuery.h

@@ -62,6 +62,8 @@ struct InstrInfoQuery {
 struct CondContext {
   Value *Cond;
   bool Invert = false;
+  // Condition is true if CxtI is in the true successor of Cond.
+  bool CondIsTrue = false;
   SmallPtrSet<Value *, 4> AffectedValues;
 
   CondContext(Value *Cond) : Cond(Cond) {}

llvm/lib/Analysis/ValueTracking.cpp

@@ -5014,6 +5014,10 @@ static KnownFPClass computeKnownFPClassFromContext(const Value *V,
                                                    const SimplifyQuery &Q) {
   KnownFPClass KnownFromContext;
 
+  if (Q.CC && Q.CC->AffectedValues.contains(V))
+    computeKnownFPClassFromCond(V, Q.CC->Cond, 0, Q.CC->CondIsTrue,
+                                Q.CxtI, KnownFromContext);
+
   if (!Q.CxtI)
     return KnownFromContext;